The appearance of a polyp can vary depending on its location in the body and its size.
Colon polyps are usually small, mushroom-shaped growths that protrude from the inner lining of the colon. They may be flat or slightly raised and can range in size from a few millimeters to several centimeters. They can be difficult to see with the naked eye, so a colonoscopy or other imaging test is necessary to detect them.
Nasal polyps, on the other hand, are typically soft, painless, and have a teardrop or grape-like shape. They are usually gray or yellowish and can range in size from a few millimeters to several centimeters. Nasal polyps can be seen during a nasal endoscopy, which involves inserting a thin, flexible tube with a camera on the end into the nostril to visualize the inside of the nasal cavity.
It's important to note that not all polyps can be seen with the naked eye, and some may require imaging tests or biopsies to detect.